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ORBilu is a project developed by
  Towards combined global monthly gravity field solutions; ; et al Scientific Conference (2013, October) Detailed reference viewed: 69 (1 UL) A variant of the differential gravimetry approach for low-low satellite-to-satellite tracking based on angular velocitiesWeigelt, Matthias  ; ; van Dam, Tonie et alScientific Conference (2013, September) Detailed reference viewed: 79 (1 UL)Derivation of angular velocities of the GRACE satellite formation from the star camera data; Weigelt, Matthias ; van Dam, Tonie et alScientific Conference (2013, June) The presentation discusses possibilites to derive common frame angular velocities from the star cameras in the GRACE system. Generally the star cameras measure the rotation of each satellite independently ... [more ▼] The presentation discusses possibilites to derive common frame angular velocities from the star cameras in the GRACE system. Generally the star cameras measure the rotation of each satellite independently from the other satellite. However, common frame rotations are also needed for various applications. Specifically in this presentation we discuss the application to a variant of the differential gravimetry approach. In this, angular rates around the crosstrack component of the so-called instantaneous relative reference frame are needed. The latter is a common reference frame formed by the inter-satellite connection of the two GRACE satellites. We will quantify the accuracy demands on the derivation of the angular velocities and discuss the possibilites to meet these demands with existing star camera observations. We will also give an outlook on new possibilites in the determination of the orientation and the derivation of angular velocities offered by the laser ranging instrument which will be used in the GRACE Follow-On mission. [less ▲] Detailed reference viewed: 111 (2 UL)Earth System Mass Transport Mission (e.motion): A Concept for Future Earth Gravity Field Measurements from Space; ; et al in Surveys in Geophysics (2013), 34(2), 141-163 In the last decade, satellite gravimetry has been revealed as a pioneering technique for mapping mass redistributions within the Earth system. This fact has allowed us to have an improved understanding of ... [more ▼] In the last decade, satellite gravimetry has been revealed as a pioneering technique for mapping mass redistributions within the Earth system. This fact has allowed us to have an improved understanding of the dynamic processes that take place within andbetween the Earth’s various constituents. Results from the Gravity Recovery And Climate Experiment (GRACE) mission have revolutionized Earth system research and have established the necessity for future satellite gravity missions. In 2010, a comprehensive team of European and Canadian scientists and industrial partners proposed the e.motion (Earth system mass transport mission) concept to the European Space Agency. The proposal is based on two tandem satellites in a pendulum orbit configuration at an altitude of about 370 km, carrying a laser interferometer inter-satellite ranging instrument and improved accelerometers. In this paper, we review and discuss a wide range of mass signals related to the global water cycle and to solid Earth deformations that were outlined in the e.motion proposal. The technological and mission challenges that need to be addressed in order to detect these signals are emphasized within the context of the scientific return. This analysis presents a broad perspective on the value and need for future satellite gravimetry missions. [less ▲] Detailed reference viewed: 168 (1 UL) |
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